feat(bar): store modes as a map of presets

This allows to apply the mode atomically and adds possibility of
defining custom modes (to be implemented).

include/bar.hpp

@@ -36,6 +36,13 @@ struct bar_margins {
   int left = 0;
 };
 
+struct bar_mode {
+  bar_layer layer;
+  bool      exclusive;
+  bool      passthrough;
+  bool      visible;
+};
+
 class BarSurface {
  protected:
   BarSurface() = default;
@@ -54,18 +61,23 @@ class BarSurface {
 
 class Bar {
  public:
+  using bar_mode_map = std::map<std::string_view, struct bar_mode>;
+  static const bar_mode_map     PRESET_MODES;
+  static const std::string_view MODE_DEFAULT;
+  static const std::string_view MODE_INVISIBLE;
+
   Bar(struct waybar_output *w_output, const Json::Value &);
   Bar(const Bar &) = delete;
   ~Bar() = default;
 
-  void setMode(const std::string &);
+  void setMode(const std::string_view &);
   void setVisible(bool visible);
   void toggle();
   void handleSignal(int);
 
   struct waybar_output *output;
   Json::Value           config;
-  struct wl_surface *   surface;
+  struct wl_surface    *surface;
   bool                  exclusive = true;
   bool                  visible = true;
   bool                  vertical = false;
@@ -77,6 +89,11 @@ class Bar {
   void getModules(const Factory &, const std::string &);
   void setupAltFormatKeyForModule(const std::string &module_name);
   void setupAltFormatKeyForModuleList(const char *module_list_name);
+  void setMode(const bar_mode &);
+
+  /* Copy initial set of modes to allow customization */
+  bar_mode_map configured_modes = PRESET_MODES;
+  std::string  last_mode_{MODE_DEFAULT};
 
   std::unique_ptr<BarSurface>                   surface_impl_;
   bar_layer                                     layer_;

src/bar.cpp

@@ -23,6 +23,35 @@ static constexpr const char* BAR_SIZE_MSG = "Bar configured (width: {}, height:
 static constexpr const char* SIZE_DEFINED =
     "{} size is defined in the config file so it will stay like that";
 
+const Bar::bar_mode_map Bar::PRESET_MODES = {  //
+    {"dock",
+     {// Modes supported by the sway config; see man sway-bar(5)
+      .layer = bar_layer::BOTTOM,
+      .exclusive = true,
+      .passthrough = false,
+      .visible = true}},
+    {"hide",
+     {//
+      .layer = bar_layer::TOP,
+      .exclusive = false,
+      .passthrough = false,
+      .visible = true}},
+    {"invisible",
+     {//
+      .layer = bar_layer::BOTTOM,
+      .exclusive = false,
+      .passthrough = true,
+      .visible = false}},
+    {"overlay",
+     {//
+      .layer = bar_layer::TOP,
+      .exclusive = false,
+      .passthrough = true,
+      .visible = true}}};
+
+const std::string_view Bar::MODE_DEFAULT = "dock";
+const std::string_view Bar::MODE_INVISIBLE = "invisible";
+
 #ifdef HAVE_GTK_LAYER_SHELL
 struct GLSSurfaceImpl : public BarSurface, public sigc::trackable {
   GLSSurfaceImpl(Gtk::Window& window, struct waybar_output& output) : window_{window} {
@@ -533,28 +562,25 @@ waybar::Bar::Bar(struct waybar_output* w_output, const Json::Value& w_config)
   }
 }
 
-void waybar::Bar::setMode(const std::string& mode) {
+void waybar::Bar::setMode(const std::string_view& mode) {
-  bool passthrough = false;
+  auto it = configured_modes.find(mode);
-  visible = true;
+  if (it != configured_modes.end()) {
-  exclusive = true;
+    last_mode_ = mode;
-  layer_ = bar_layer::BOTTOM;
+    setMode(it->second);
-
+  } else {
-  if (mode == "hide") {
+    spdlog::warn("Unknown mode \"{}\" requested", mode);
-    exclusive = false;
+    last_mode_ = MODE_DEFAULT;
-    layer_ = bar_layer::TOP;
+    setMode(configured_modes.at(MODE_DEFAULT));
-    visible = false;
-  } else if (mode == "invisible") {
-    visible = false;
-  } else if (mode == "overlay") {
-    exclusive = false;
-    layer_ = bar_layer::TOP;
-    passthrough = true;
   }
+}
 
+void waybar::Bar::setMode(const struct bar_mode& mode) {
+  layer_ = mode.layer;
+  exclusive = mode.exclusive;
   surface_impl_->setLayer(layer_);
   surface_impl_->setExclusiveZone(exclusive);
-  surface_impl_->setPassThrough(passthrough);
+  surface_impl_->setPassThrough(mode.passthrough);
-  setVisible(visible);
+  setVisible(mode.visible);
 }
 
 void waybar::Bar::onMap(GdkEventAny*) {